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New High Power, Surface Mount Option for N-Channel JFET
September 25, 2017

Solid State Devices, Inc. (SSDI) is proud to release the SFU290 and SFU291 N-Channel JFETS to replace Vishay Siliconix’s U290 / U291 series. The SFU290 and SFU291 deliver very fast switching speed with a maximum turn-on time of 15 nsec. These 30 volt devices also provide low on-state resistance at 3 Ω. These features will benefit applications such as low on-resistance analog / digital switches, choppers, sample-and-hold, normally “on” switches, and current limiters.

SSDI specializes in providing optimal die / package combinations to best meet its customers’ requirements. So, in addition to manufacturing the 0.35 W drop-in replacement in a TO-52 package, SSDI’s engineers developed a new 4 W surface mount option in the SMD.22 package for applications requiring high power dissipation. The SMD.22 also offers a much lower maximum thermal resistance of 30°C/W as opposed to 357°C/W for the TO-52 package.

When programs encounter end-of-life or obsolescence issues, SSDI can provide a variety of hermetic product options, which may include high density packaging, improved performance, and higher reliability. Whether the situation calls for a drop-in replacement or a new solution, SSDI’s strong die foundry relationships and in-house engineering / manufacturing capabilities allow it to effectively accommodate the specific needs of individual applications.

Refer to data sheet for ratings and case outlines


  • Very Low ON Resistance
  • Very Fast Switching Speed
  • No Forward Recovery
  • Available in Hermetically Sealed, Surface Mount Power Package (SMD.22) for Applications Requiring High Power Dissipation Up to 4 W
  • High Off-Isolation
  • Low Capacitance:
    CRSS = 30 pF max
  • Low Insertion Loss
  • Replacement for Vishay Siliconix U290 & U291
  • TX, TXV, and S Level Screening Available - Based on MIL-PRF-19500, Screening Flows Available on Request


  • Low On Resistance Analog / Digital Switches
  • Choppers
  • Sample-and-Hold
  • Normally "On" Switches
  • Current Limiters

Contact SSDI at (562) 404-4474 or for more information or to request samples.

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